
Concept explainers
a.
To calculate: The monthly cost of the gym.
a.

Answer to Problem 74PFA
The monthly cost of the gym is $40.
Explanation of Solution
Given:
Paul joins a gym that has an initial membership fee and a monthly cost. He pays a total of $295 after 3 months, and $495 after 8 months.
Calculation:
Let the initial membership fee be x and monthly cost be y .
Then, after 3 months total cost will be
And, after 8 months total cost will be
By problem, Paul pays a total of $295 after 3 months, and $495 after 8 months.
Then,
Subtracting (1) from (2),
Conclusion:
The monthly cost of the gym is $40.
b.
To calculate:The initial membership fee of the gym.
b.

Answer to Problem 74PFA
The initial membership fee of the gym is $175.
Explanation of Solution
Given:
Paul joins a gym that has an initial membership fee and a monthly cost. He pays a total of $295 after 3 months, and $495 after 8 months.
Calculation:
Putting
Conclusion:
The initial membership fee of the gym is $175.
c.
To calculate:An equation for the total cost C as a function of the number of months, m .
c.

Answer to Problem 74PFA
An equation for the total cost C as a function of the number of months, m is
Explanation of Solution
Given:
Paul joins a gym that has an initial membership fee and a monthly cost. He pays a total of $295 after 3 months, and $495 after 8 months.
Calculation:
The initial fee of the gym is $175.
The monthly cost of the gym per month is $40.
Then, the monthly cost for m months is $ 40m .
Therefore, total cost of the gym for m months
Here C is the total cost.
Then,
Conclusion:
An equation for the total cost C as a function of the number of months, m is
d.
To calculate:The amount Paul will be paid after one year.
d.

Answer to Problem 74PFA
Paul will pay $655 after one year.
Explanation of Solution
Given:
Paul joins a gym that has an initial membership fee and a monthly cost. He pays a total of $295 after 3 months, and $495 after 8 months.
Calculation:
The total cost of gym for m months is
Then, the total cost for one year, that is, 12 months
Conclusion:
Paul will pay $655 after one year.
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